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A kind of graphene composite airgel wave-absorbing material and its preparation method and application

A graphene composite and wave-absorbing material technology, applied in the field of wave-absorbing materials, can solve the problems of inability to precisely control the internal pore size, difficult to adjust wave-absorbing performance, volume shrinkage, etc., and achieve a simple and convenient test method and excellent absorption. Wave performance, light weight effect

Active Publication Date: 2022-04-29
DONGHUA UNIV
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Problems solved by technology

[0005] In the current research work, it is known that the internal pore size of airgel has a great influence on the microwave absorption performance, but the graphene aerogels reported so far all have the problem of volume shrinkage
Literature Lingxiao Li, Bucheng Li, Junping Zhang.J.Mater.Chem.A.2016,4,512-518, researchers prepared graphene airgel by reducing graphene oxide with dopamine by hydrothermal method, but there is still 8.3% volume shrinkage , the researchers also studied other reducing agents, such as triethylamine, ethylenediamine, and sodium sulfite, and found that the hydrogels prepared by these reducing agents were either very fragile or showed severe volume shrinkage, so it was impossible to precisely control the internal pore size. The purpose of the size, it is difficult to adjust its absorbing performance

Method used

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  • A kind of graphene composite airgel wave-absorbing material and its preparation method and application
  • A kind of graphene composite airgel wave-absorbing material and its preparation method and application
  • A kind of graphene composite airgel wave-absorbing material and its preparation method and application

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Embodiment 1

[0051] (1) Weigh 2.706g FeCl 3 ·6H 2 O was dissolved in 80 mL of ethylene glycol, then 7.200 g of sodium acetate and 2.000 g of polyethylene glycol were added while stirring, and stirred vigorously for 30 min. Then the solution was poured into the reaction kettle, heated to 200°C, and kept for 24h. After the reaction is completed, cool to room temperature with the furnace, magnetically separate the black product, wash with ethanol and distilled water three times, and vacuum dry at 60°C for 12 hours to obtain Fe 3 o 4 nanoparticles.

[0052] (2) 0.5g of the above Fe 3 o 4 The microspheres were dispersed in a mixed solution containing 40mL of water, 16mL of absolute ethanol and 0.2mL of ammonia, and ultrasonically treated for 60min to form a uniform suspension. Then, 0.2 g of resorcinol was added to the solution, and the mixture was mechanically stirred at room temperature for 30 minutes, then a formaldehyde solution (38% by mass) was added, and polymerization was started ...

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Abstract

The invention relates to a graphene composite airgel wave-absorbing material and its preparation method and application, comprising graphene oxide, modifier and Fe 3 o 4 @C nanoparticle composition, with a three-dimensional network structure. Preparation method comprises: (1) solvothermal method prepares Fe 3 o 4 ; (2) Fe 3 o 4 Stirring reaction with polymer monomer to obtain Fe coated polymer 3 o 4 (3) carbonization treatment under an inert atmosphere to obtain Fe 3 o 4 @C; Ultrasonic dispersion with modifier in ethanol dispersion of graphene oxide, one-step alcohol-thermal method. The material has no volume shrinkage, high absorption strength, effective absorption bandwidth, and excellent microwave absorption performance in the K-band. It has broad application potential and market prospects in the fields of electromagnetic shielding and electromagnetic safety protection of communication equipment.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, in particular to a graphene composite airgel wave-absorbing material and its preparation method and application. Background technique [0002] With the rapid development of modern radar and microwave electronic technology, stealth technology, as an effective means to improve the survival, penetration and deep strike capabilities of weapon systems, has become one of the hot spots for military powers to compete for military high-tech. Radar searches for targets by emitting electromagnetic waves, and then locks on targets by the electromagnetic waves reflected by the detected party, and tracks, locates and identifies them. The development of radar stealth materials that absorb electromagnetic waves efficiently is one of the effective ways to improve the survivability of weapon systems, and has become the most valuable and effective tactical penetration means in modern warfare. At t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C01B32/194C01G49/08C01B32/15B82Y30/00
CPCB82Y30/00C01B32/15C01B32/184C01B32/194C01G49/08C01P2004/80C01P2006/90
Inventor 王连军马家鑫栗文浩杨庆坤范宇驰江莞
Owner DONGHUA UNIV
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